Find all points on the curve x^2-y^2=1 passes through

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Find the solution of each of the following.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236